The interesting use of perspective was the first thing that caught my eye (from the thumbnail): the direction of the brigde - or whatever it is - in the foreground was an excellent way to establish space with a good sense of depth, without blocking out the rest of the area. Of course, this would not have worked so well if you messed up the rest of the composition, but you didn't - light and dark areas both work very well and are not overdone. They simply emphasize the interesting areas of the enviroment without stopping people from exploring the rest of the image.

You've also managed to convey the scale of the area through the few people and improvised dwellings in the lower right half of the image - a clever solution that works well and doesn't seem weird or out of place. Also, this gave you an oportunity to deliberately work with the complementary contrasts of red and green, further emphasizing the areas of interest.

..If I'm not mistaken, there's also a subtle use of photo textures in some parts of the image, but they won't be noticed before one starts looking for them. In other words: you've obviously got skills when it comes to this sort of work (no, really? What was that about a Masters project..hmm..).

All right, sorry for rambling on for so long. It's just, I'm finally getting more into the world of digital art and such myself, and when I saw this excellent work I couldn't suppress the urge to attempt an analysis. Of course, I'm fully aware that not a single shred of what I wrote should be new to you, and I guess I'm just picking at the surface of the many aspects involved in your work.

Anyway, thanks for sharing your work with us, and if it isn't too late, good luck with the project!!